Wet Edge lets you add a unique watercolor effect. You can also draw watercolor-like illustrations with it.
Prepare an illustration with a painted base.
From ①the Material tool, select ②Material Patterns (Color).
This time, we selected ①hemp.
In order to obtain the texture of paper, turn on ①Repeat, to shrink the material and make the pattern appear finer.
Tap ①✓ to apply the material.
After applying the material, open ①the Layer window and from ②blend mode, select ③Soft Light.
From ①Brush window, select ②Watercolor (Point).
Open ①the Layer window, and to the base of the line drawing, add ②a new layer.
This time we set ③the opacity level to approximately 25%. Turning on ④Clipping lets you add shadows without painting outside the drawing.
Gently tap on to add shadows.
Once you are done adding shadows, open ①the Layer window, and over the shadow you just added, add ②a new layer and turn on ③Clipping.
From ①the Tool Selection window, select ②Filter.
Select ①Wet Edge.
Drag ①the sliders left and right to change the width and intensity of the water color boundary.
Tap ①✓ to finish.
By repeating this process, you can produce a picture that resembles a watercolor painting.